Introduction to the hottest high pressure check va

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Introduction to high pressure check valve

high pressure check valve refers to the valve that automatically opens and closes the valve disc depending on the flow of the medium itself, which is used to prevent the backflow of the medium, also known as check valve, one-way valve, backflow valve, and back pressure valve. The check valve is an automatic valve. Its main function is to prevent the backflow of medium, the reverse rotation of pump and drive motor, and the discharge of container medium. The check valve can also be used to supply the auxiliary system whose pressure may rise above the system pressure. Check valves are mainly divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis)

internal thread check valve and butterfly check valve belong to this type of valve, including swing check valve and lift check valve. Swing check valve has a hinge mechanism, and a valve disc like a door freely rests on the inclined valve seat surface. In order to ensure that the valve clack can reach the appropriate position of the valve seat surface every time, the valve clack is designed in the hinge mechanism, so that the valve clack has enough swing space and makes the valve clack truly and comprehensively contact the valve seat. The valve clack can be made entirely of metal, or inlaid with leather, rubber or synthetic coverage on metal, which depends on the requirements of service performance. When the swing check valve is fully opened, the fluid pressure is almost unimpeded, so the pressure drop through the valve is relatively small. The disc seat of the lift check valve is located on the sealing surface of the valve seat on the valve body. Except that the valve disc can rise and fall freely, the rest of the valve is like a stop valve. The fluid pressure lifts the valve disc from the sealing surface of the valve seat, and the medium backflow causes the valve disc to fall back to the valve seat and cut off the flow. According to the service conditions, the valve disc can be of all metal structure, or it can be in the form of inlaying rubber pads or rubber rings on the valve disc frame. Like the stop valve, the passage of fluid through the lift check valve is also narrow, so the pressure drop through the lift check valve is larger than that of the swing check valve, and the flow of the low-temperature check valve is rarely limited. A. Structure and installation method of high-pressure check valve: 1. The disc of high-pressure check valve is disc-shaped and rotates around the rotating shaft of the valve seat channel. Because the channel in the valve is linear, the flow resistance is smaller than that of the rising butterfly check valve. It is suitable for large-diameter occasions with low flow rate and constant flow change, but it is not suitable for pulsating flow, and its sealing performance is not as good as that of the rising and falling type. Butterfly check valves are divided into single disc type, double disc type and multi half type. These three forms are mainly divided according to the valve diameter, in order to prevent the medium from stopping flowing or reversing, and weaken the hydraulic impact. 2. For the check valve with high-pressure check valve disc sliding along the vertical centerline of the valve body, the internal thread check valve can only be installed on the horizontal pipeline. When the valve disc on the high-pressure small-diameter check valve can be straightened, the wire surface shall not be damaged, and the ball shall be used. The body shape of butterfly check valve is the same as that of stop valve (which can be used in common with stop valve), so its fluid resistance coefficient is large. Its structure is similar to the stop valve, and the valve body and disc are the same as the stop valve. The upper part of the valve clack and the lower part of the valve cover are processed with a guide sleeve. The guide sleeve of the valve clack can rise and fall freely in the guide sleeve of the valve cap. When the medium flows downstream, the valve clack is opened by the thrust of the medium. When the medium stops flowing, the valve clack falls on the valve seat by itself, preventing the reverse flow of the medium. The direction of medium inlet and outlet channels and valve seat channels of straight through butterfly check valve 6 When turning off, adjust the brightness to the minimum vertical; The direction of the medium inlet and outlet channels of the vertical lift check valve is the same as that of the valve seat channel, and its flow resistance is smaller than that of the straight through type. 3. High pressure check valve: then do you know what stages should be carried out in the tensile test of metal material tensile testing machine? A check valve whose disc rotates around a pin in the valve seat. The disc check valve is simple in structure and can only be installed on horizontal pipelines, with good sealing performance. 4. High pressure check valve: a valve whose disc slides along the center line of the valve body. Pipeline check valve is a new type of valve. It has small volume, light weight and good processing technology. It is one of the development directions of check valve. However, the fluid resistance coefficient is slightly larger than that of swing check valve. 5. High pressure check valve: This valve is used as a boiler feed water and steam shut-off valve. It has the comprehensive function of lift check valve, stop valve or angle valve. In addition, there are some check valves that are not suitable for the installation of pump outlet, such as bottom valve, spring type, Y-type check valve, etc. B. Application and performance specification of high pressure check valve: This valve is used as a device to prevent the reverse flow of medium on industrial pipelines. Performance specification C, function principle and structure description of high-pressure check valve: during the use of this valve, the medium flows in the direction of the arrow in the figure. 1. When the medium flows in the specified direction, the valve disc is opened by the medium force; When the medium is countercurrent, due to the dead weight of the valve disc and the effect of the reverse force of the medium, the sealing surface of the valve disc and the valve seat is closed, so as to prevent the countercurrent of the medium. 2. The sealing surface of the valve body and disc adopts stainless steel surfacing. 3. The structural length of this valve shall comply with the provisions of GB, and the flange connection size shall comply with the provisions of jb/t

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